package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import org.aspectj.lang.reflect.MethodSignature;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/*
 * 自定义切面，实现公共字段自动填充
 */
@Aspect
@Slf4j
@Component
public class AutoFillAspect {
    /*
     * 拦截需要自动填充的类
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    /*
     * 拦截需要自动填充的方法，获取参数，填充创建时间、更新时间
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行数据填充");
        //获取当前方法参数
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = annotation.value();
        //获取当前参数
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        Object entity= args[0];
        //创建时间或者更新时间
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        if (operationType == OperationType.INSERT){
            //给4个属性赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                setCreateTime.invoke(entity, LocalDateTime.now());
                setUpdateTime.invoke(entity, LocalDateTime.now());
                setCreateUser.invoke(entity, BaseContext.getCurrentId());
                setUpdateUser.invoke(entity, BaseContext.getCurrentId());
            }
            catch (Exception e) {
                e.printStackTrace();
            }

        }
        else if (operationType == OperationType.UPDATE){
            //设置更新时间
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(entity, LocalDateTime.now());
                setUpdateUser.invoke(entity, BaseContext.getCurrentId());
            }
            catch (Exception e) {
                e.printStackTrace();
            }

        }

    }
}
